Test your wits against the BBC's updated edition of the maddeningly challenging "Hitchhiker's Guide to the Galaxy" text adventure game.
Text adventure games may seem like ancient history but they have aspects in common with today's casual and social games.
"Pac-Txt" is a text-based homage to the venerable classic arcade game.
Immersion implies single-tasking. And people increasingly multi-task much of the time.
It's hard to believe, but the iconic game will have its 30th anniversary Saturday. Many in the games industry say its influence is as strong as ever.